Such functionality can be achieved via additional client-side script and the RadSlider Client-Side API. You can find attached a sample page that demonstrates a possible approach for implementing the desired feature. Please use it as a reference for your further development.
All the best,
the Telerik team
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How about if this slider in updatepanel?
Outside of the update panel working good. But when i put in to the update panel after update panel updating
returning first mark-up. maybe i need register this functions with startup scripts?